Conveyer



April 21, 1931. E. H. 'ALLFREE CONYEYER Filed Dec. 10, 1927 5Sheets-Sheet l April 21, 1931.

E. H. ALLFREE CONVEYER Filed Dec. 10, 1927 5 Sheets-Sheet 2 7 gwuentocEH-fll lfree Mad/ 3 MW April 21, 1931. E. H. ALLFREE CONVEYER Filed Dec.10, 1927 5 Sheets-Sheet 3.

Apr l 1931- E. H. ALLFREE CONVEYER Filed Dec. 10, 1927 5 Sheets-Sheet 4April 1931. E. H. ALLFREE CONVEYER Filed Dec. 10, 1927 5 Sheets-Sheet II I I. I III fllgfree,

Patented Apr. 21, 1931 EDWIN I-I. Ann-FR E, or mo vrou, OHIO CONVEYERApplication filed December 10, 1927. Serial No. 239,110.

This invention relates to improvements in conveyers of the jigging orshaker type for conveying loose or broken material, such as coal, ores,and the like, and comprising a conduit and an engine which imparts tothe condui a relatively shortreciprocatory motion of such a characterthat material in the conduit will be moved along the same.

Objects of the inventionare to provide an improved conveyer of the classreferred to; to provide an improved driving engine or mechanism of anefhcient nature adapted to be employed interchangeably at either side oftheconveyer conduitwithout change in the relative height of theconveyerconduit and d 'iving engine, which will provide for selecting thedirection of conveyance at will, and which when located at either sideof the conveyer conduit providesfor readily reversing the direction ofconveyance without change in the relative positions of the conveyor condnit and drivingengine.

Another object of the invention is to provide in an improved drivingenginegpossessing the characteristics referred to, for the attachment ofthe connection between the driving engine and the conveyer conduit atthe under side of the conduit centrally of its sides when the drivingengine is located at either side of the conveyer conduit. 7

A. further object of the invention is to provide an improved drivingengineof the character-referred to which will be of simple, compactconstruction adapted to be easily'as- 'sembled and connected with theconveyer conduit, and readily portable to meet the various changingconditions and demands encounterec in the use of such conveyers in coalmines and for other purposes.

' The invention, with other objects, novel features, and advantagesthereof will be understood from the hereinafter contained detaileddescription, when considered in con: nection with the accompanyingdrawings, forming part hereof and illustrating one embodiment of theinvention.

the drawings: I

Figure 1 is a top plan view of a conveyer constructed in accordance withthe present invention, the conveyer conduit being shown broken away. 1 J

Fig. 2 is a vertical section on the-line 22 of Figure 1.. l

Fig. 3 is a detail horizontal'section on the line 33 of Figure 2. 7 a

Fig. 4 is a detail top plan view of themgins driving arm. I q e V, Fig.5 is a detail central longitudinal section of theengine driving arm. I IFig. 6 is a section on the line 66 of Figure d. i

Fig. 7 is a detail side elevation of a portion of the conveyor conduit.Fig.8 is a detail view of the conveyer conduit, a portion of the conduitbeing shown in transverse section and a part thereof in end elevation.

Fig. 9 is a detail central longitudinal section of the adjoining endportions of'two of the trough sections of'the conveyer conduit. 7

Figs. 10, 11, and 12 are diagrammatic views illustrating theprogressive. increaseand lessening in velocity respectively of alternatestrokes in the reciprocatory motion imparted to the conduit.

While a specific preferred embodiment of the invention is illust ated inthe drawings, it .will of course be understood that changes andvariations may be made in theparticular construction shown, and theinvention embodied in other forms asv will appeal to.

those skilled" in the art and falling within the scope of theappendedclaimswithout departing from the spirit of the invention.

Referringto detailed description of the particular embodiment of theinvention illustrated in the drawings, theconveyerconduit or trough isshown as made up of a plurality of sections 1 detachably securedtogether. i The ends of adjoining trough sections 1 are arranged inabutting relation, as shown, with the inner faces of the end portions ofadjoining trough section'spresenting with each otherasmooth continuoussurface so that the conveyer conduit is adapted to be operated to movematerial along the same'in either direction, the trough sections beingshown provided at the under side with bands 3 oifset from the ends ofthe sections to form overlapping seats 3' for the ends of adjacenttrough sections. Any suitable means may be employed for detachablysecuring the trough sections 1 together and for supporting the same forreciprocatory movement. The coupling means for the sections shown in thedrawings is of conventional form comprising bolts and nuts 45 engagingeyes or sleeves 6 on hands 7 secured to the under side of the troughsections. The supporting means shown is also of well known standardconstruction comprising tracks 8 on the trough sections 1 cooperatingwith rollers 9 working in tracks 10.

The invention comprehends driving mechanism for imparting to theconveyer conduit reciprocatory motion wherein alternate strokesrespectively progressively increase and diminish in velocity, togetherwith means for reversing the direction of the alternate accelerated andretarded strokes in the reciprocatory movement whereby the direction ofconveyance of material along the conveyer conduit may be changed.Rcterring in detail to the particular embodiment the dri ing mechanismshown in the drawings, 11 designates a suitable support or stand, thesame being shown as comprising a base made up of side longitudinal steelchannel members 12. 13, a transversely extending plate 1 1 andtransverse members 15, 16, suitably secured together. 17 designates a.housing section or plate supported upon and suitably secured to thelongitudinal side members 12. said housing section being disposed abovethe plate member 14. Upon the housing section or plate 17 is an upperhousing section. 18 secured thereto by bolts and nuts 19, 20. Mountedupon the support or stand 11. at one end there of to one side of thehousing sections 17, 18 is an electric motor 21. 22 designates ahorizontally extending worm shatt supported in suitable bearings 23. 24in the upper housing section 18, said Worm sh aft he disposed at one endof said housing section and having .an end portion 22 extending outsidethereof and connected with the shaft 25 of the motor 21. On the endportion 22 of the worm shaft 22 is fixed a fly wheel 26. The worm shaftis connected with the motor shaft 25 my a sleeve 27 fitting over andsuitably keyed to the latter and provided with a flange 28 that fitsagainst one side of the fly wheel 26 and is secured thereto by bolts 29.Meshing with the worm shaft 22 is a worm wheel 31, which is fixed on avertical shalt 30 within the upper housing section 18. said shaft beingsupported in suitable anti-friction bearings 33., on the housingsections 17, 18. The lower bearing 32 for the vertical shaft 30 isshown. supported by a tubular member or ring 34; that fits in adjoiningopenings in the housing sections 17, 18, and has a flange interposedbetween said housing sections an d secured thereto by bolts and nuts 36,37. On the lower end oi the vertical shaft disposed within the spacebetween the bottom plate 14 and the housing section 17 is a crank 38.The upper housing section 18 is adapted to hold lubricant for the wormgearing 22. 31, and the bearings therein and arranged within saidhousing section is a tubular member 39 surrounding the vertical. shaft30 and serving as an oil. battle. the normal level of the oil in saidhousing section being below the top of said tubular member. The tubularmember 39 is secured by screws 40 upon the supporting ring 34, and saidtubular member engages over and holds in place the lower bearing 32 ofthe vertical shaft 30. 41 designates a sight teed lubricator ofconventional form mounted upon the upper housing section 18 forsupplying lubricant to the pin 38 of the crank 38, the vertical shaft 30being provided with an interior channel. 42 leading to the pin 38 of thecrank 38 and connected with the lubricator 41.

Disposed longitudinally of the support or stand 11 at the lower partthereof and sup ported at one end thereon for horizontal oscillatorymovement is a drive arm 43. which is connected intermediate its endswith the crank 38 by a rod 44. said rod engaging av pin 45 on said drivearm. The drive arm 13. in the present instance, is shown made up of aframe 46 and upper and lower plates 47, 48. riveted thereto. the armbeing widest at a point between and tapering toward its ends. At one endthe drive arm. 43 has an eye or bearing 49 engaging a pivot pin 50 onone end of the support or stand 11. The other end of the drive arm 43projects beyond one end of the support or stand 11, as shown. and isconnected with the conveyer conduit 1. at the under side thereofcentrally of its sides so that rectilinear movement will be imparted tothe conveyor conduit by the drive arm. The connection between the drivearm 43 and the conveyer conduit 1 is shown as comprising a link 51having a vertical conveyor con nection 52 at one end with the conveyerconduit 1. At its other end the link 52 has a vertical pivotalconnection 53 with a clevis member 54 which in turn has a horizontalpivotal connection with the drive arm 43. said drive arm having abearing 43 engaging a vertical pivot bolt 55 of the clevis member 54.

The driving mechanism hereinbefore described operates as follows:

The motor 21 rotates the vertical crank shaft 30 through the worm shaft22 and worm wheel 31 at reduced speed, the crank 38 being accordinglyrotated at relatively slow speed. The relatively slow rotary motion ofthe crank 38 is converted, through the rod 44, into the desiredreciprocatory motion and transmitted to the drive arm 43, which impartsthe same through the link and clevis connections 51-54, to the conveyorconduit 1, the conveyer conduit being reciprocated the forward andreverse strokes of the reciprocatory motion imparted to the conveyorconduit 1 by the driving mechanism are indicated by the velocity diagramin Figure 10. Starting slowly at A, the conveyer conduit 1 travelsforward as indicated by the arrow in the direction of conveyance, withslowly increasing velocity through the greater part of the stroke,reaching the maximum at a point near the end of the stroke indicated inthe diagram at M, after which it rapidly declines to the minimum as theconveyer conduit 1 comes to a relatively sudden stop at the pointdesignated B. On the return stroke the conveyor conduit 1 starts rapidlyin the oppositedirection and rapidly increases in velocity until themaximum is reached early in the stroke at a point indicated'at m in thediagram. From then on throughout the remaining greater portion of thestroke it slowly declines in velocity to the minimum and comes to arelatively gradual stop at the point designated A.

. As will be understood during each revolution of the crank the sequenceof change in velocity of the reciprocating member is,-slow increase,rapid decline during the forward stroke in the direction of conveyance)and rapid increase. slow decline, (during the return stroke). It will benoted that maximum acceleration occurs toward the end'of the forwardstroke and toward the beginning of the return stroke,thevelocitysequen'ce for the return stroke being exactly the reverse or theopposite of the velocity sequenc'e'of the stroke forward in thedirection of conveyance, the period of time or velocitybf each stroke,as a whole, being the same.

The angular effect of the relative short connecting rod 44 in changingthe regular rotary motion of the crankv 38 into the accelerated andretarded reciprocatory motion as hereinbefore explained is illustrateddiagrammatically in'Figures 11 and 12'of the drawings. Referringparticularly to Figure 11 it will be noted that the stroke ofthe crank Hequals the distance between the pointsA-B; that the-strokeof the link Lequals the distance CD the distance between the'points AB equals thedistance (3-D, and C'F equals the distance between the points designatedFD. The distance between the points AE, however, is more than thedistance E -B, and therefore while the distance (l-F equals the distanceFD, the speed at CF is less than FD.

By changing the relative location of the pin 45 on the drive arm 43tothe position at the other side of thedrive arm indicated by dotted linesin Figure 4 of the drawings,

which dotted line position is substantially 180 from the position of thepin 45 illustrated-in full lines, theeitect of the angularity of thecrank 38 will be reversed, and the di rection of the alternateaccelerated and retarded strokes, and the direction of conveyance willbe reversed. In the particular exemplification of the inventionillustrated in:

the drawings, in order to provide for changing the location of the pin45 on the drive arm 43 and 'the relative angularity ofthe rod 44 toreverse the direction of the alternate accelerated and retarded strokes,and;

the direction of conveyance, said pin 45 is fixed on adisk 56 which ismounted for rotary adjustment on the drive arm 43; Thedisk 56 is}provided with'a peripheral flange 57 and with an' open central bearingor hub 58.

The disk 56 is arranged between the plates 47, 48,0f the drive arm "43.It is supported for rotary adjustment by said'plates and also by acentral stud 59 secured to the bottom plate 47 by bolts and nuts 60, 61.said stud engaging the central bearing or hub 58 of the disk 56 andhaving a flange 61 engaging over the upper-side of said bearing or hub.The

disk 56 is provided with a toothed portion 62 extending substantiallyover half of its peripher'y and 63' is a pinion supportedforro- 'tationon the driving arm between the plates 47 48, and meshing with thetoothed peripheral portion. 62 of thefdis'k 56 for turning the sametoits differentpositions of adjustment,

said pinion being adapted to be operated a spindle 64 to which thepinion'is fixediand which is provided with an angular faced head; asshown, to be engaged by a wrench or other tool suitable for the purpose.Means is provided for locking the disk 56 in its different positions ofadjustment. The disk 56 is provided with apertures 6666 located near theperiphery thereof'at diametrically opposite points. Aligned apertures67' and 68 are provided in'the plates 47 and 48, and 65 is a boltadapted to be, engaged with said last mentioned apertures and eitheroneof the apertures 66-66 in the disk 56 to lock the disk in its differentpositions of adjustment. In Figure 4 of the drawings, the locking bolt65 is shown engaging the apertures 66'jof the disk 56. As will bereadily understood, all that isrequired to change the directionof'conveyance, is to remove the locking bolt 65, rotate the disk 56 bythe pinion 63 throughsubstantially 180 until the other aperture66 ofsaid disk isin alignment with the apertures67, 68 of theplates 47, 48,and" then look the disk 56 in position by engaging the bolt with theapertures 67-68 and the apertures 66'.

70 and 71 designate stop portions on the upper plate 47 adapted to beengaged by the collar portion 69 of the pin 45 to limit the rotarymovement of the disk 56 in turning the same to its different positionsof adjustment.

It will be noted that the particular construction of conveyerhereinbefore set forth poswsses the following important novelcharacteristics.

First: It is either right or left hand, that is, with any given lay outof the conveyer conduit and direction of conveyance, the driving engineor mechanism may be placed on either side of the conveyer conduitwithout any change in the relative height of the conveyer conduit anddriving engine.

Second: The direction of conveyance may be selected at will. With anygiven lay out of conveyer conduit and with the driving engine located toeither the right or left hand side of the conveyer conduit, thedirection of conveyance may be reversed Without changing the location ofthe driving engine, without any change in the arrangement or elevationof the conveyer conduit, and without even disconnecting the drive rodconnections between the driving engine and the conveyer conduit.

Third: The connection from the driving engine to the conveyer conduit isunder slung an centrally attached at all times, whether the drivingengine is located on one side or the other and regardless of thedirection of conwe ance.

ourth The improved driving mechanism is of simple, compact constructionadapted to be easily connected with the conduit and readily portable.

What I claim is:

1. A conveyer comprising a conduit supported for reciprocatory movement,and an engine for imparting to the conduit reciprocatory motion whereinslowly accelerated but rapidly retarded advance alternates with rapidlyaccelerated but slowly retarded return, and means entirely in saidengine for reversing the direction of said advance and return in thereciprocatory movement providing for the operation of the conveyer tomore material along the same in either direction.

2. A conveyer comprising a conduit sup ported for reciprocatory motion,and an engine for imparting to the conduit reciprocatory motion whereinslowly accelerated but rapidly retarded advance alternates with rapidlyaccelerated but slowly retarded return, a drive connection between theengine and the conduit at the under side thereof, and means entirely insaid engine for reversing thfi direction of the alternate advance and return in the reciprocatory movement providing for the operation of theconveyer to move material along the same in either direction.

3. A conveyer including a conduit sup ported for reciprocatory movement.and operating means for imparting to the conduit reciprocatory motionwherein slowly accel erated but rapidly retarded advance alternates withrapidly accelerated but slowly retarded return, said operating meanscomprising a rotating crank, a reciprocating member, and a rodconnection between the crank and said reciprocating member, and meansfor reversing the angularity of said connecting rod relatively to saidcrank and reciprocating member to reverse the direction of the alternateadvance and return of the reciprocating member providing for theoperation of the conduit to move material along the same in eitherdirection.

4. A conveyer including a conduit supported for reciprocatory movement,and operating means for imparting to the conduit reciprocatory motionwherein slowly accelerated but rapidly retarded advance alternates withrapidly accelerated but slowly r'etarded return, said operating meanscompris ing a rotating crank, an arm pivotally supported at one end foroscillation, a connection between the other end of said arm and theconduit, a rod connection between the crank and said arm intermediateits ends whereby the arm is oscillated by the crank, and means forreversing the angularity of said rod relatively to the crank and the armto reverse the direction of the alternate advance and return in thereciprocatory motion imparted to the conduit.

5. A conveyer including a conduit supported for reciprocatory movement,and operating means for imparting to the conduit rcciprocatory motionwherein slowly accelerated but rapidly retarded advance alternates withrapidly accelerated but slowly retarded return, said operating meanscomprising a rotating crank, an arm pivotally supported at one end foroscillation, a connection between the other end of said arm and theconduit, a pin on said arm, and a rod connection between said pin andsaid crank whereby the arm is oscillated by the crank, said pin beingadjustably mounted on the arm to provide for reversing the angularity ofthe rod relatively to the crank and the arm to reverse the alternateadvance and return in the reciprocating movement imparted to the arm.

6. A conveyer including a conduit supported for reciprocatory movement,and operating means for imparting to the conduit reciprocatory motionwherein slowly accelerated but rapidly retarded advance alternates withrapidly accelerated but slowly retarded return, said operating meanscomprising a ro tating crank, an arm pivotally supported at one end foroscillation, a connection between the other end of said arm and theconduit, a: rod connection between'the crank and said arm intermediateits ends whereby the arm is oscillated by the crank, and means forreversing the angularity of said rod relatively to'the crank and the armto reversethe direction of the alternate advance and returnin thereciprocatory motion imparted to the conduit, said last mentioned meanscompris ing a disk mounted upon said arm for rotary adjustment, meansfor locking the disk'to the arm in different positions of adjustmentrelatively thereto, and a pin on disk to which the rod is Connected. '7.A conveyer including a conduit supported for reciprocatory movement, andoperating means for imparting to the conduit reciprocatory motionwherein slowly aocelerated but rapidly retarded advance alter nates:with rapidly accelerated but slowly retarded return, said operatingmeans comprising a rotating crank, an arm pivotally supported at one endfor oscillation, a connection between the other end of said arm and theconduit,- a rod connection between the crank and said arm intermediateits ends whereby the arm is oscillated by the crank, and means forreversing the angularity of said rod relatively to the crank and the armto reverse the direction of the alternate advance and return in thereciprocatory motion imparted to the conduit, said last mentioned meanscomprising a disk mounted upon said arm for rotary adjustment and havinga toothed peripheral portion, a toothed memher on the arm meshing withthe toothed peripheral portion of said disk, means for actuating saidtoothed member to adjust said disk, and means for locking the disk tothe arm in different positionsof adjustment rela- I tively thereto.

8. A conveyer including a conduit supported for reciprocatory movement,and 0peratingmeans for imparting to the conduit reclprocatory motionwherein slowly accelerated but rapidly retarded advance alternates withrapidly accelerated but slowly res tarded return, said operating meanscomprising a rotating crank, an'arm pivotally supported at one end andoperatively connected intermediate its ends with said crank tobeoscillated thereby, anoperative connection between the other end of saidarm and the V conduit,"and means for reversing the direction of theadvance and return in the reciprocatory movement of said arm providingfor operation of the conduit to move material along the same in eitherdirection.

9. A conveyer including a conduit supported for reciprocatory movement,and operating means for imparting to the con duit reciprocatory motion,said operating means comprising a connecting rod to other end ofthe rodto reciprocatory movement, wherein the advance is slowly accelerated butrapidly retarded and the return is rapidly accelerated but slowlyretarded respectively relative to the linear velocity of the rotatingend of therod, and means for reversing the direction of said advance andreturn movements of the said connecting rod.

10. A conveyer including a conduit sup ported for reciprocatorymovement, operating means for imparting to-the conduit reciprocatorymotion, said operating means comprising a rotating driving member and areciprocatory followermember, each with fined paths of'movemenhthereciprocatory follower member having slowly accelerated but rapidlyretarded advance alternating with rapidly accelerated but slowlyretarded return respectively relative to the linear ve'- locity oftherotating driving member, and

'means' for reversing the directionot said advance and return of thesaid follower mem-j withslowly accelerated but rapidly retarded advancestrokes alternating with rapidly accelerated but slowly retarded strokesrespec-v tively relative to the linear velocity of the crank, and meansfor reversing the direction otthe said advance and return strokesimparted to the oscillating member.

12A conve er includin a conduit Sn 3- ported for reciprocatory movement,and opioo crating means for imparting to the conduit reciprocatorymotion wherein slowlyaccel erated but rapidly retarded advancealternates with rapidly accelerated but slowly retarded return, saidoperating means com prising a support, a drive arm pivotally mounted atone end on the support for horizontal oscillatory movement andoperatively connected at its other end with the conduit, a verticallyextending shaft mount-a ed for'rotation on the support, a crankon thelower part of said shaftoperatively connected with said drive armforoscillating the same, and means for reversing the direction of theadvance and return strokesein the reciprocation of said drive armproviding for the operation of the conduit to move material along thesame in either direction.

131A conveyer including a conduit sup ported for reciprocatory movement,and op.- erating means for imparting to the conduit reciprocatory motionwherein slowly accelerated but rapidly retarded advance alternates withrapidly accelerated but slowly retarded return, said operating meanscomprising a support, a drive arm pivotally mounted at one end on thesupport for horizontal oscillatory movement and operatively connected atits other end with the conduit, a vertically extending rotary shaftmounted on the su port, a crank on the lower part of said sha t, a rodconnection between the crank and the drive arm whereby the arm isoscillated by said crank, and means for reversing the angularity of saidrod relatively to the crank and the arm to reverse the direction of thealternate advance and return strokes imparted to the drive arm.

14. A conveyer including a conduit supported for reciprocatory movement,and operating means for imparting to the conduit rcciprocatory motionwherein slowly accelerated but rapidly retarded advance alternates withrapidly accelerated but slow y retarded return, said operating meanscomprising a support, a drive arm pivotally mounted at one end on thesupport for horizontal oscillatory movement and operatively connected atits other end with the conduit, a vertically extending rotary shaft onthe support, a crank on the lower part of said shaft, :1 rod connectionbetween the crank and drive arm whereby the arm is oscillated by thecrank, said rod connection including}; a pin on the drive arm to whichsaid rod is connected, said pin being adjustable on said drive arm tochange the angularity of sac d rod relatively to the drive arm and crankto reverse the advance and return strokes in the reciprocation of thedrive arm.

15. A conveyer including a conduit supported for reciprocatory movement,and operating means for imparting reciprocatory motion to the conduit,said means comprising a support, an electric motor on said support, ahorizontally extending rotary worm shaft on the support coupled with theshaft of the motor, a vertically extending rotary shaft on the support,a worm wheel fixed on the vertical shaft and meshing with said wormshaft, a crank on the lower part of the vertical shaft, an arm pivotallysupported at one end on the support for horizontal oscillatorymovementand operatively connected at its other end with the, conduit,and a rod connection between said crank and arm intermediate its ends.

16. A conveyer including a conduit supported for reciprocatory movement,and operating means including a stand having upper and lower housingsections at one end there of, a motor mounted on the stand at one sideof said housing sections, a horizontally extending rotary worm shaftdisposed within the upper housing section and coupled to the shaft ofthe motor, a vertical rotary shaft extending through the upper housingsection, a worm wheel within the upper housing fixed on the verticalshaft and meshing with the worm shaft, a crank on the lower part of thevertical shaft disposed within the lower housing section, a horizontallydisposed drive arm pivotally supported at one end of the stand at thelower part thereof for oscillation and operatively connected with saidcrank, and a connection between the other end of the drive arm and theconduit.

17. A conveyer including a conduit supported for reciprocatory movement,and operating means including a stand having at one end a housingdisposed above the base thereof, a motor on the stand at one side ofsaid housing, a horizontally extending worm shaft disposed within thehousing and coupled with the shaft of the motor, a vertical shaftextending through the housing to the under side thereof, a worm wheelwithin the housing fixed on the vertical shaft and meshing with saidworm shaft, a crank on the lower end of the vertical shaft, a drive armpivotally supported at one end on the lower part of the stand andoperatively connected with said crank; and a connection between theother end of the drive arm and the conduit, said shaft being providedwith a lubri eating channel leading from its upper end to the saidcrank, and a lubricator mounted on the top of the housing and connectedwith said channel.

18. A conveyer including a conduit supported for reciprocatory movement,and operating means including a stand having at one end a housingdisposed above the base thereof, a motor on the stand at one side ofsaid housing, a horizontally extending worm shaft disposed within thehousing and coupled with the shaft of the motor, a vertical shaftextending through the housing to the under side thereof, a worm wheelWithin the housing fixed on the vertical shaft and meshing with saidworm shaft, a crank on the lower end of the Vertical shaft, a drive armpivotally supported at one end on the lower part of the stand andoperatively connected with said crank, and a connection between theother end of the drive arm and the conduit, means for supplyinglubricant to said housing, and a tubular member within the housingsurrounding the vertical shaft and serving as means for retaininglubricant within said housing.

In testimony whereof I hereunto afiix my signature.

EDWIN H. ALLFREE.

